CGObjC.cpp revision 210299
1//===---- CGBuiltin.cpp - Emit LLVM Code for builtins ---------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This contains code to emit Objective-C code as LLVM code. 11// 12//===----------------------------------------------------------------------===// 13 14#include "CGObjCRuntime.h" 15#include "CodeGenFunction.h" 16#include "CodeGenModule.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclObjC.h" 19#include "clang/AST/StmtObjC.h" 20#include "clang/Basic/Diagnostic.h" 21#include "llvm/ADT/STLExtras.h" 22#include "llvm/Target/TargetData.h" 23using namespace clang; 24using namespace CodeGen; 25 26/// Emits an instance of NSConstantString representing the object. 27llvm::Value *CodeGenFunction::EmitObjCStringLiteral(const ObjCStringLiteral *E) 28{ 29 llvm::Constant *C = 30 CGM.getObjCRuntime().GenerateConstantString(E->getString()); 31 // FIXME: This bitcast should just be made an invariant on the Runtime. 32 return llvm::ConstantExpr::getBitCast(C, ConvertType(E->getType())); 33} 34 35/// Emit a selector. 36llvm::Value *CodeGenFunction::EmitObjCSelectorExpr(const ObjCSelectorExpr *E) { 37 // Untyped selector. 38 // Note that this implementation allows for non-constant strings to be passed 39 // as arguments to @selector(). Currently, the only thing preventing this 40 // behaviour is the type checking in the front end. 41 return CGM.getObjCRuntime().GetSelector(Builder, E->getSelector()); 42} 43 44llvm::Value *CodeGenFunction::EmitObjCProtocolExpr(const ObjCProtocolExpr *E) { 45 // FIXME: This should pass the Decl not the name. 46 return CGM.getObjCRuntime().GenerateProtocolRef(Builder, E->getProtocol()); 47} 48 49 50RValue CodeGenFunction::EmitObjCMessageExpr(const ObjCMessageExpr *E, 51 ReturnValueSlot Return) { 52 // Only the lookup mechanism and first two arguments of the method 53 // implementation vary between runtimes. We can get the receiver and 54 // arguments in generic code. 55 56 CGObjCRuntime &Runtime = CGM.getObjCRuntime(); 57 bool isSuperMessage = false; 58 bool isClassMessage = false; 59 ObjCInterfaceDecl *OID = 0; 60 // Find the receiver 61 llvm::Value *Receiver = 0; 62 switch (E->getReceiverKind()) { 63 case ObjCMessageExpr::Instance: 64 Receiver = EmitScalarExpr(E->getInstanceReceiver()); 65 break; 66 67 case ObjCMessageExpr::Class: { 68 const ObjCObjectType *ObjTy 69 = E->getClassReceiver()->getAs<ObjCObjectType>(); 70 assert(ObjTy && "Invalid Objective-C class message send"); 71 OID = ObjTy->getInterface(); 72 assert(OID && "Invalid Objective-C class message send"); 73 Receiver = Runtime.GetClass(Builder, OID); 74 isClassMessage = true; 75 break; 76 } 77 78 case ObjCMessageExpr::SuperInstance: 79 Receiver = LoadObjCSelf(); 80 isSuperMessage = true; 81 break; 82 83 case ObjCMessageExpr::SuperClass: 84 Receiver = LoadObjCSelf(); 85 isSuperMessage = true; 86 isClassMessage = true; 87 break; 88 } 89 90 CallArgList Args; 91 EmitCallArgs(Args, E->getMethodDecl(), E->arg_begin(), E->arg_end()); 92 93 QualType ResultType = 94 E->getMethodDecl() ? E->getMethodDecl()->getResultType() : E->getType(); 95 96 if (isSuperMessage) { 97 // super is only valid in an Objective-C method 98 const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl); 99 bool isCategoryImpl = isa<ObjCCategoryImplDecl>(OMD->getDeclContext()); 100 return Runtime.GenerateMessageSendSuper(*this, Return, ResultType, 101 E->getSelector(), 102 OMD->getClassInterface(), 103 isCategoryImpl, 104 Receiver, 105 isClassMessage, 106 Args, 107 E->getMethodDecl()); 108 } 109 110 return Runtime.GenerateMessageSend(*this, Return, ResultType, 111 E->getSelector(), 112 Receiver, Args, OID, 113 E->getMethodDecl()); 114} 115 116/// StartObjCMethod - Begin emission of an ObjCMethod. This generates 117/// the LLVM function and sets the other context used by 118/// CodeGenFunction. 119void CodeGenFunction::StartObjCMethod(const ObjCMethodDecl *OMD, 120 const ObjCContainerDecl *CD) { 121 FunctionArgList Args; 122 // Check if we should generate debug info for this method. 123 if (CGM.getDebugInfo() && !OMD->hasAttr<NoDebugAttr>()) 124 DebugInfo = CGM.getDebugInfo(); 125 126 llvm::Function *Fn = CGM.getObjCRuntime().GenerateMethod(OMD, CD); 127 128 const CGFunctionInfo &FI = CGM.getTypes().getFunctionInfo(OMD); 129 CGM.SetInternalFunctionAttributes(OMD, Fn, FI); 130 131 Args.push_back(std::make_pair(OMD->getSelfDecl(), 132 OMD->getSelfDecl()->getType())); 133 Args.push_back(std::make_pair(OMD->getCmdDecl(), 134 OMD->getCmdDecl()->getType())); 135 136 for (ObjCMethodDecl::param_iterator PI = OMD->param_begin(), 137 E = OMD->param_end(); PI != E; ++PI) 138 Args.push_back(std::make_pair(*PI, (*PI)->getType())); 139 140 StartFunction(OMD, OMD->getResultType(), Fn, Args, OMD->getLocStart()); 141} 142 143/// Generate an Objective-C method. An Objective-C method is a C function with 144/// its pointer, name, and types registered in the class struture. 145void CodeGenFunction::GenerateObjCMethod(const ObjCMethodDecl *OMD) { 146 StartObjCMethod(OMD, OMD->getClassInterface()); 147 EmitStmt(OMD->getBody()); 148 FinishFunction(OMD->getBodyRBrace()); 149} 150 151// FIXME: I wasn't sure about the synthesis approach. If we end up generating an 152// AST for the whole body we can just fall back to having a GenerateFunction 153// which takes the body Stmt. 154 155/// GenerateObjCGetter - Generate an Objective-C property getter 156/// function. The given Decl must be an ObjCImplementationDecl. @synthesize 157/// is illegal within a category. 158void CodeGenFunction::GenerateObjCGetter(ObjCImplementationDecl *IMP, 159 const ObjCPropertyImplDecl *PID) { 160 ObjCIvarDecl *Ivar = PID->getPropertyIvarDecl(); 161 const ObjCPropertyDecl *PD = PID->getPropertyDecl(); 162 bool IsAtomic = 163 !(PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic); 164 ObjCMethodDecl *OMD = PD->getGetterMethodDecl(); 165 assert(OMD && "Invalid call to generate getter (empty method)"); 166 StartObjCMethod(OMD, IMP->getClassInterface()); 167 168 // Determine if we should use an objc_getProperty call for 169 // this. Non-atomic properties are directly evaluated. 170 // atomic 'copy' and 'retain' properties are also directly 171 // evaluated in gc-only mode. 172 if (CGM.getLangOptions().getGCMode() != LangOptions::GCOnly && 173 IsAtomic && 174 (PD->getSetterKind() == ObjCPropertyDecl::Copy || 175 PD->getSetterKind() == ObjCPropertyDecl::Retain)) { 176 llvm::Value *GetPropertyFn = 177 CGM.getObjCRuntime().GetPropertyGetFunction(); 178 179 if (!GetPropertyFn) { 180 CGM.ErrorUnsupported(PID, "Obj-C getter requiring atomic copy"); 181 FinishFunction(); 182 return; 183 } 184 185 // Return (ivar-type) objc_getProperty((id) self, _cmd, offset, true). 186 // FIXME: Can't this be simpler? This might even be worse than the 187 // corresponding gcc code. 188 CodeGenTypes &Types = CGM.getTypes(); 189 ValueDecl *Cmd = OMD->getCmdDecl(); 190 llvm::Value *CmdVal = Builder.CreateLoad(LocalDeclMap[Cmd], "cmd"); 191 QualType IdTy = getContext().getObjCIdType(); 192 llvm::Value *SelfAsId = 193 Builder.CreateBitCast(LoadObjCSelf(), Types.ConvertType(IdTy)); 194 llvm::Value *Offset = EmitIvarOffset(IMP->getClassInterface(), Ivar); 195 llvm::Value *True = 196 llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 1); 197 CallArgList Args; 198 Args.push_back(std::make_pair(RValue::get(SelfAsId), IdTy)); 199 Args.push_back(std::make_pair(RValue::get(CmdVal), Cmd->getType())); 200 Args.push_back(std::make_pair(RValue::get(Offset), getContext().LongTy)); 201 Args.push_back(std::make_pair(RValue::get(True), getContext().BoolTy)); 202 // FIXME: We shouldn't need to get the function info here, the 203 // runtime already should have computed it to build the function. 204 RValue RV = EmitCall(Types.getFunctionInfo(PD->getType(), Args, 205 FunctionType::ExtInfo()), 206 GetPropertyFn, ReturnValueSlot(), Args); 207 // We need to fix the type here. Ivars with copy & retain are 208 // always objects so we don't need to worry about complex or 209 // aggregates. 210 RV = RValue::get(Builder.CreateBitCast(RV.getScalarVal(), 211 Types.ConvertType(PD->getType()))); 212 EmitReturnOfRValue(RV, PD->getType()); 213 } else { 214 if (Ivar->getType()->isAnyComplexType()) { 215 LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), 216 Ivar, 0); 217 ComplexPairTy Pair = LoadComplexFromAddr(LV.getAddress(), 218 LV.isVolatileQualified()); 219 StoreComplexToAddr(Pair, ReturnValue, LV.isVolatileQualified()); 220 } 221 else if (hasAggregateLLVMType(Ivar->getType())) { 222 bool IsStrong = false; 223 if ((IsAtomic || (IsStrong = IvarTypeWithAggrGCObjects(Ivar->getType()))) 224 && CurFnInfo->getReturnInfo().getKind() == ABIArgInfo::Indirect 225 && CGM.getObjCRuntime().GetCopyStructFunction()) { 226 LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), 227 Ivar, 0); 228 llvm::Value *GetCopyStructFn = 229 CGM.getObjCRuntime().GetCopyStructFunction(); 230 CodeGenTypes &Types = CGM.getTypes(); 231 // objc_copyStruct (ReturnValue, &structIvar, 232 // sizeof (Type of Ivar), isAtomic, false); 233 CallArgList Args; 234 RValue RV = RValue::get(Builder.CreateBitCast(ReturnValue, 235 Types.ConvertType(getContext().VoidPtrTy))); 236 Args.push_back(std::make_pair(RV, getContext().VoidPtrTy)); 237 RV = RValue::get(Builder.CreateBitCast(LV.getAddress(), 238 Types.ConvertType(getContext().VoidPtrTy))); 239 Args.push_back(std::make_pair(RV, getContext().VoidPtrTy)); 240 // sizeof (Type of Ivar) 241 uint64_t Size = getContext().getTypeSize(Ivar->getType()) / 8; 242 llvm::Value *SizeVal = 243 llvm::ConstantInt::get(Types.ConvertType(getContext().LongTy), Size); 244 Args.push_back(std::make_pair(RValue::get(SizeVal), 245 getContext().LongTy)); 246 llvm::Value *isAtomic = 247 llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 248 IsAtomic ? 1 : 0); 249 Args.push_back(std::make_pair(RValue::get(isAtomic), 250 getContext().BoolTy)); 251 llvm::Value *hasStrong = 252 llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 253 IsStrong ? 1 : 0); 254 Args.push_back(std::make_pair(RValue::get(hasStrong), 255 getContext().BoolTy)); 256 EmitCall(Types.getFunctionInfo(getContext().VoidTy, Args, 257 FunctionType::ExtInfo()), 258 GetCopyStructFn, ReturnValueSlot(), Args); 259 } 260 else { 261 if (PID->getGetterCXXConstructor()) { 262 ReturnStmt *Stmt = 263 new (getContext()) ReturnStmt(SourceLocation(), 264 PID->getGetterCXXConstructor(), 265 0); 266 EmitReturnStmt(*Stmt); 267 } 268 else { 269 LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), 270 Ivar, 0); 271 EmitAggregateCopy(ReturnValue, LV.getAddress(), Ivar->getType()); 272 } 273 } 274 } else { 275 LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), 276 Ivar, 0); 277 CodeGenTypes &Types = CGM.getTypes(); 278 RValue RV = EmitLoadOfLValue(LV, Ivar->getType()); 279 RV = RValue::get(Builder.CreateBitCast(RV.getScalarVal(), 280 Types.ConvertType(PD->getType()))); 281 EmitReturnOfRValue(RV, PD->getType()); 282 } 283 } 284 285 FinishFunction(); 286} 287 288/// GenerateObjCSetter - Generate an Objective-C property setter 289/// function. The given Decl must be an ObjCImplementationDecl. @synthesize 290/// is illegal within a category. 291void CodeGenFunction::GenerateObjCSetter(ObjCImplementationDecl *IMP, 292 const ObjCPropertyImplDecl *PID) { 293 ObjCIvarDecl *Ivar = PID->getPropertyIvarDecl(); 294 const ObjCPropertyDecl *PD = PID->getPropertyDecl(); 295 ObjCMethodDecl *OMD = PD->getSetterMethodDecl(); 296 assert(OMD && "Invalid call to generate setter (empty method)"); 297 StartObjCMethod(OMD, IMP->getClassInterface()); 298 299 bool IsCopy = PD->getSetterKind() == ObjCPropertyDecl::Copy; 300 bool IsAtomic = 301 !(PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_nonatomic); 302 303 // Determine if we should use an objc_setProperty call for 304 // this. Properties with 'copy' semantics always use it, as do 305 // non-atomic properties with 'release' semantics as long as we are 306 // not in gc-only mode. 307 if (IsCopy || 308 (CGM.getLangOptions().getGCMode() != LangOptions::GCOnly && 309 PD->getSetterKind() == ObjCPropertyDecl::Retain)) { 310 llvm::Value *SetPropertyFn = 311 CGM.getObjCRuntime().GetPropertySetFunction(); 312 313 if (!SetPropertyFn) { 314 CGM.ErrorUnsupported(PID, "Obj-C getter requiring atomic copy"); 315 FinishFunction(); 316 return; 317 } 318 319 // Emit objc_setProperty((id) self, _cmd, offset, arg, 320 // <is-atomic>, <is-copy>). 321 // FIXME: Can't this be simpler? This might even be worse than the 322 // corresponding gcc code. 323 CodeGenTypes &Types = CGM.getTypes(); 324 ValueDecl *Cmd = OMD->getCmdDecl(); 325 llvm::Value *CmdVal = Builder.CreateLoad(LocalDeclMap[Cmd], "cmd"); 326 QualType IdTy = getContext().getObjCIdType(); 327 llvm::Value *SelfAsId = 328 Builder.CreateBitCast(LoadObjCSelf(), Types.ConvertType(IdTy)); 329 llvm::Value *Offset = EmitIvarOffset(IMP->getClassInterface(), Ivar); 330 llvm::Value *Arg = LocalDeclMap[*OMD->param_begin()]; 331 llvm::Value *ArgAsId = 332 Builder.CreateBitCast(Builder.CreateLoad(Arg, "arg"), 333 Types.ConvertType(IdTy)); 334 llvm::Value *True = 335 llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 1); 336 llvm::Value *False = 337 llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 0); 338 CallArgList Args; 339 Args.push_back(std::make_pair(RValue::get(SelfAsId), IdTy)); 340 Args.push_back(std::make_pair(RValue::get(CmdVal), Cmd->getType())); 341 Args.push_back(std::make_pair(RValue::get(Offset), getContext().LongTy)); 342 Args.push_back(std::make_pair(RValue::get(ArgAsId), IdTy)); 343 Args.push_back(std::make_pair(RValue::get(IsAtomic ? True : False), 344 getContext().BoolTy)); 345 Args.push_back(std::make_pair(RValue::get(IsCopy ? True : False), 346 getContext().BoolTy)); 347 // FIXME: We shouldn't need to get the function info here, the runtime 348 // already should have computed it to build the function. 349 EmitCall(Types.getFunctionInfo(getContext().VoidTy, Args, 350 FunctionType::ExtInfo()), 351 SetPropertyFn, 352 ReturnValueSlot(), Args); 353 } else if (IsAtomic && hasAggregateLLVMType(Ivar->getType()) && 354 !Ivar->getType()->isAnyComplexType() && 355 IndirectObjCSetterArg(*CurFnInfo) 356 && CGM.getObjCRuntime().GetCopyStructFunction()) { 357 // objc_copyStruct (&structIvar, &Arg, 358 // sizeof (struct something), true, false); 359 llvm::Value *GetCopyStructFn = 360 CGM.getObjCRuntime().GetCopyStructFunction(); 361 CodeGenTypes &Types = CGM.getTypes(); 362 CallArgList Args; 363 LValue LV = EmitLValueForIvar(TypeOfSelfObject(), LoadObjCSelf(), Ivar, 0); 364 RValue RV = RValue::get(Builder.CreateBitCast(LV.getAddress(), 365 Types.ConvertType(getContext().VoidPtrTy))); 366 Args.push_back(std::make_pair(RV, getContext().VoidPtrTy)); 367 llvm::Value *Arg = LocalDeclMap[*OMD->param_begin()]; 368 llvm::Value *ArgAsPtrTy = 369 Builder.CreateBitCast(Arg, 370 Types.ConvertType(getContext().VoidPtrTy)); 371 RV = RValue::get(ArgAsPtrTy); 372 Args.push_back(std::make_pair(RV, getContext().VoidPtrTy)); 373 // sizeof (Type of Ivar) 374 uint64_t Size = getContext().getTypeSize(Ivar->getType()) / 8; 375 llvm::Value *SizeVal = 376 llvm::ConstantInt::get(Types.ConvertType(getContext().LongTy), Size); 377 Args.push_back(std::make_pair(RValue::get(SizeVal), 378 getContext().LongTy)); 379 llvm::Value *True = 380 llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 1); 381 Args.push_back(std::make_pair(RValue::get(True), getContext().BoolTy)); 382 llvm::Value *False = 383 llvm::ConstantInt::get(Types.ConvertType(getContext().BoolTy), 0); 384 Args.push_back(std::make_pair(RValue::get(False), getContext().BoolTy)); 385 EmitCall(Types.getFunctionInfo(getContext().VoidTy, Args, 386 FunctionType::ExtInfo()), 387 GetCopyStructFn, ReturnValueSlot(), Args); 388 } else if (PID->getSetterCXXAssignment()) { 389 EmitAnyExpr(PID->getSetterCXXAssignment(), (llvm::Value *)0, false, true, 390 false); 391 392 } else { 393 // FIXME: Find a clean way to avoid AST node creation. 394 SourceLocation Loc = PD->getLocation(); 395 ValueDecl *Self = OMD->getSelfDecl(); 396 ObjCIvarDecl *Ivar = PID->getPropertyIvarDecl(); 397 DeclRefExpr Base(Self, Self->getType(), Loc); 398 ParmVarDecl *ArgDecl = *OMD->param_begin(); 399 DeclRefExpr Arg(ArgDecl, ArgDecl->getType(), Loc); 400 ObjCIvarRefExpr IvarRef(Ivar, Ivar->getType(), Loc, &Base, true, true); 401 402 // The property type can differ from the ivar type in some situations with 403 // Objective-C pointer types, we can always bit cast the RHS in these cases. 404 if (getContext().getCanonicalType(Ivar->getType()) != 405 getContext().getCanonicalType(ArgDecl->getType())) { 406 ImplicitCastExpr ArgCasted(Ivar->getType(), CastExpr::CK_BitCast, &Arg, 407 CXXBaseSpecifierArray(), false); 408 BinaryOperator Assign(&IvarRef, &ArgCasted, BinaryOperator::Assign, 409 Ivar->getType(), Loc); 410 EmitStmt(&Assign); 411 } else { 412 BinaryOperator Assign(&IvarRef, &Arg, BinaryOperator::Assign, 413 Ivar->getType(), Loc); 414 EmitStmt(&Assign); 415 } 416 } 417 418 FinishFunction(); 419} 420 421void CodeGenFunction::GenerateObjCCtorDtorMethod(ObjCImplementationDecl *IMP, 422 ObjCMethodDecl *MD, 423 bool ctor) { 424 llvm::SmallVector<CXXBaseOrMemberInitializer *, 8> IvarInitializers; 425 MD->createImplicitParams(CGM.getContext(), IMP->getClassInterface()); 426 StartObjCMethod(MD, IMP->getClassInterface()); 427 for (ObjCImplementationDecl::init_const_iterator B = IMP->init_begin(), 428 E = IMP->init_end(); B != E; ++B) { 429 CXXBaseOrMemberInitializer *Member = (*B); 430 IvarInitializers.push_back(Member); 431 } 432 if (ctor) { 433 for (unsigned I = 0, E = IvarInitializers.size(); I != E; ++I) { 434 CXXBaseOrMemberInitializer *IvarInit = IvarInitializers[I]; 435 FieldDecl *Field = IvarInit->getMember(); 436 QualType FieldType = Field->getType(); 437 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(Field); 438 LValue LV = EmitLValueForIvar(TypeOfSelfObject(), 439 LoadObjCSelf(), Ivar, 0); 440 EmitAggExpr(IvarInit->getInit(), LV.getAddress(), 441 LV.isVolatileQualified(), false, true); 442 } 443 // constructor returns 'self'. 444 CodeGenTypes &Types = CGM.getTypes(); 445 QualType IdTy(CGM.getContext().getObjCIdType()); 446 llvm::Value *SelfAsId = 447 Builder.CreateBitCast(LoadObjCSelf(), Types.ConvertType(IdTy)); 448 EmitReturnOfRValue(RValue::get(SelfAsId), IdTy); 449 } else { 450 // dtor 451 for (size_t i = IvarInitializers.size(); i > 0; --i) { 452 FieldDecl *Field = IvarInitializers[i - 1]->getMember(); 453 QualType FieldType = Field->getType(); 454 const ConstantArrayType *Array = 455 getContext().getAsConstantArrayType(FieldType); 456 if (Array) 457 FieldType = getContext().getBaseElementType(FieldType); 458 459 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(Field); 460 LValue LV = EmitLValueForIvar(TypeOfSelfObject(), 461 LoadObjCSelf(), Ivar, 0); 462 const RecordType *RT = FieldType->getAs<RecordType>(); 463 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 464 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(); 465 if (!Dtor->isTrivial()) { 466 if (Array) { 467 const llvm::Type *BasePtr = ConvertType(FieldType); 468 BasePtr = llvm::PointerType::getUnqual(BasePtr); 469 llvm::Value *BaseAddrPtr = 470 Builder.CreateBitCast(LV.getAddress(), BasePtr); 471 EmitCXXAggrDestructorCall(Dtor, 472 Array, BaseAddrPtr); 473 } else { 474 EmitCXXDestructorCall(Dtor, 475 Dtor_Complete, /*ForVirtualBase=*/false, 476 LV.getAddress()); 477 } 478 } 479 } 480 } 481 FinishFunction(); 482} 483 484bool CodeGenFunction::IndirectObjCSetterArg(const CGFunctionInfo &FI) { 485 CGFunctionInfo::const_arg_iterator it = FI.arg_begin(); 486 it++; it++; 487 const ABIArgInfo &AI = it->info; 488 // FIXME. Is this sufficient check? 489 return (AI.getKind() == ABIArgInfo::Indirect); 490} 491 492bool CodeGenFunction::IvarTypeWithAggrGCObjects(QualType Ty) { 493 if (CGM.getLangOptions().getGCMode() == LangOptions::NonGC) 494 return false; 495 if (const RecordType *FDTTy = Ty.getTypePtr()->getAs<RecordType>()) 496 return FDTTy->getDecl()->hasObjectMember(); 497 return false; 498} 499 500llvm::Value *CodeGenFunction::LoadObjCSelf() { 501 const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl); 502 return Builder.CreateLoad(LocalDeclMap[OMD->getSelfDecl()], "self"); 503} 504 505QualType CodeGenFunction::TypeOfSelfObject() { 506 const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl); 507 ImplicitParamDecl *selfDecl = OMD->getSelfDecl(); 508 const ObjCObjectPointerType *PTy = cast<ObjCObjectPointerType>( 509 getContext().getCanonicalType(selfDecl->getType())); 510 return PTy->getPointeeType(); 511} 512 513RValue CodeGenFunction::EmitObjCSuperPropertyGet(const Expr *Exp, 514 const Selector &S, 515 ReturnValueSlot Return) { 516 llvm::Value *Receiver = LoadObjCSelf(); 517 const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl); 518 bool isClassMessage = OMD->isClassMethod(); 519 bool isCategoryImpl = isa<ObjCCategoryImplDecl>(OMD->getDeclContext()); 520 return CGM.getObjCRuntime().GenerateMessageSendSuper(*this, 521 Return, 522 Exp->getType(), 523 S, 524 OMD->getClassInterface(), 525 isCategoryImpl, 526 Receiver, 527 isClassMessage, 528 CallArgList()); 529 530} 531 532RValue CodeGenFunction::EmitObjCPropertyGet(const Expr *Exp, 533 ReturnValueSlot Return) { 534 Exp = Exp->IgnoreParens(); 535 // FIXME: Split it into two separate routines. 536 if (const ObjCPropertyRefExpr *E = dyn_cast<ObjCPropertyRefExpr>(Exp)) { 537 Selector S = E->getProperty()->getGetterName(); 538 if (isa<ObjCSuperExpr>(E->getBase())) 539 return EmitObjCSuperPropertyGet(E, S, Return); 540 return CGM.getObjCRuntime(). 541 GenerateMessageSend(*this, Return, Exp->getType(), S, 542 EmitScalarExpr(E->getBase()), 543 CallArgList()); 544 } else { 545 const ObjCImplicitSetterGetterRefExpr *KE = 546 cast<ObjCImplicitSetterGetterRefExpr>(Exp); 547 Selector S = KE->getGetterMethod()->getSelector(); 548 llvm::Value *Receiver; 549 if (KE->getInterfaceDecl()) { 550 const ObjCInterfaceDecl *OID = KE->getInterfaceDecl(); 551 Receiver = CGM.getObjCRuntime().GetClass(Builder, OID); 552 } else if (isa<ObjCSuperExpr>(KE->getBase())) 553 return EmitObjCSuperPropertyGet(KE, S, Return); 554 else 555 Receiver = EmitScalarExpr(KE->getBase()); 556 return CGM.getObjCRuntime(). 557 GenerateMessageSend(*this, Return, Exp->getType(), S, 558 Receiver, 559 CallArgList(), KE->getInterfaceDecl()); 560 } 561} 562 563void CodeGenFunction::EmitObjCSuperPropertySet(const Expr *Exp, 564 const Selector &S, 565 RValue Src) { 566 CallArgList Args; 567 llvm::Value *Receiver = LoadObjCSelf(); 568 const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl); 569 bool isClassMessage = OMD->isClassMethod(); 570 bool isCategoryImpl = isa<ObjCCategoryImplDecl>(OMD->getDeclContext()); 571 Args.push_back(std::make_pair(Src, Exp->getType())); 572 CGM.getObjCRuntime().GenerateMessageSendSuper(*this, 573 ReturnValueSlot(), 574 Exp->getType(), 575 S, 576 OMD->getClassInterface(), 577 isCategoryImpl, 578 Receiver, 579 isClassMessage, 580 Args); 581 return; 582} 583 584void CodeGenFunction::EmitObjCPropertySet(const Expr *Exp, 585 RValue Src) { 586 // FIXME: Split it into two separate routines. 587 if (const ObjCPropertyRefExpr *E = dyn_cast<ObjCPropertyRefExpr>(Exp)) { 588 Selector S = E->getProperty()->getSetterName(); 589 if (isa<ObjCSuperExpr>(E->getBase())) { 590 EmitObjCSuperPropertySet(E, S, Src); 591 return; 592 } 593 CallArgList Args; 594 Args.push_back(std::make_pair(Src, E->getType())); 595 CGM.getObjCRuntime().GenerateMessageSend(*this, ReturnValueSlot(), 596 getContext().VoidTy, S, 597 EmitScalarExpr(E->getBase()), 598 Args); 599 } else if (const ObjCImplicitSetterGetterRefExpr *E = 600 dyn_cast<ObjCImplicitSetterGetterRefExpr>(Exp)) { 601 const ObjCMethodDecl *SetterMD = E->getSetterMethod(); 602 Selector S = SetterMD->getSelector(); 603 CallArgList Args; 604 llvm::Value *Receiver; 605 if (E->getInterfaceDecl()) { 606 const ObjCInterfaceDecl *OID = E->getInterfaceDecl(); 607 Receiver = CGM.getObjCRuntime().GetClass(Builder, OID); 608 } else if (isa<ObjCSuperExpr>(E->getBase())) { 609 EmitObjCSuperPropertySet(E, S, Src); 610 return; 611 } else 612 Receiver = EmitScalarExpr(E->getBase()); 613 ObjCMethodDecl::param_iterator P = SetterMD->param_begin(); 614 Args.push_back(std::make_pair(Src, (*P)->getType())); 615 CGM.getObjCRuntime().GenerateMessageSend(*this, ReturnValueSlot(), 616 getContext().VoidTy, S, 617 Receiver, 618 Args, E->getInterfaceDecl()); 619 } else 620 assert (0 && "bad expression node in EmitObjCPropertySet"); 621} 622 623void CodeGenFunction::EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S){ 624 llvm::Constant *EnumerationMutationFn = 625 CGM.getObjCRuntime().EnumerationMutationFunction(); 626 llvm::Value *DeclAddress; 627 QualType ElementTy; 628 629 if (!EnumerationMutationFn) { 630 CGM.ErrorUnsupported(&S, "Obj-C fast enumeration for this runtime"); 631 return; 632 } 633 634 if (const DeclStmt *SD = dyn_cast<DeclStmt>(S.getElement())) { 635 EmitStmt(SD); 636 assert(HaveInsertPoint() && "DeclStmt destroyed insert point!"); 637 const Decl* D = SD->getSingleDecl(); 638 ElementTy = cast<ValueDecl>(D)->getType(); 639 DeclAddress = LocalDeclMap[D]; 640 } else { 641 ElementTy = cast<Expr>(S.getElement())->getType(); 642 DeclAddress = 0; 643 } 644 645 // Fast enumeration state. 646 QualType StateTy = getContext().getObjCFastEnumerationStateType(); 647 llvm::Value *StatePtr = CreateMemTemp(StateTy, "state.ptr"); 648 EmitNullInitialization(StatePtr, StateTy); 649 650 // Number of elements in the items array. 651 static const unsigned NumItems = 16; 652 653 // Get selector 654 IdentifierInfo *II[] = { 655 &CGM.getContext().Idents.get("countByEnumeratingWithState"), 656 &CGM.getContext().Idents.get("objects"), 657 &CGM.getContext().Idents.get("count") 658 }; 659 Selector FastEnumSel = 660 CGM.getContext().Selectors.getSelector(llvm::array_lengthof(II), &II[0]); 661 662 QualType ItemsTy = 663 getContext().getConstantArrayType(getContext().getObjCIdType(), 664 llvm::APInt(32, NumItems), 665 ArrayType::Normal, 0); 666 llvm::Value *ItemsPtr = CreateMemTemp(ItemsTy, "items.ptr"); 667 668 llvm::Value *Collection = EmitScalarExpr(S.getCollection()); 669 670 CallArgList Args; 671 Args.push_back(std::make_pair(RValue::get(StatePtr), 672 getContext().getPointerType(StateTy))); 673 674 Args.push_back(std::make_pair(RValue::get(ItemsPtr), 675 getContext().getPointerType(ItemsTy))); 676 677 const llvm::Type *UnsignedLongLTy = ConvertType(getContext().UnsignedLongTy); 678 llvm::Constant *Count = llvm::ConstantInt::get(UnsignedLongLTy, NumItems); 679 Args.push_back(std::make_pair(RValue::get(Count), 680 getContext().UnsignedLongTy)); 681 682 RValue CountRV = 683 CGM.getObjCRuntime().GenerateMessageSend(*this, ReturnValueSlot(), 684 getContext().UnsignedLongTy, 685 FastEnumSel, 686 Collection, Args); 687 688 llvm::Value *LimitPtr = CreateMemTemp(getContext().UnsignedLongTy, 689 "limit.ptr"); 690 Builder.CreateStore(CountRV.getScalarVal(), LimitPtr); 691 692 llvm::BasicBlock *NoElements = createBasicBlock("noelements"); 693 llvm::BasicBlock *SetStartMutations = createBasicBlock("setstartmutations"); 694 695 llvm::Value *Limit = Builder.CreateLoad(LimitPtr); 696 llvm::Value *Zero = llvm::Constant::getNullValue(UnsignedLongLTy); 697 698 llvm::Value *IsZero = Builder.CreateICmpEQ(Limit, Zero, "iszero"); 699 Builder.CreateCondBr(IsZero, NoElements, SetStartMutations); 700 701 EmitBlock(SetStartMutations); 702 703 llvm::Value *StartMutationsPtr = CreateMemTemp(getContext().UnsignedLongTy); 704 705 llvm::Value *StateMutationsPtrPtr = 706 Builder.CreateStructGEP(StatePtr, 2, "mutationsptr.ptr"); 707 llvm::Value *StateMutationsPtr = Builder.CreateLoad(StateMutationsPtrPtr, 708 "mutationsptr"); 709 710 llvm::Value *StateMutations = Builder.CreateLoad(StateMutationsPtr, 711 "mutations"); 712 713 Builder.CreateStore(StateMutations, StartMutationsPtr); 714 715 llvm::BasicBlock *LoopStart = createBasicBlock("loopstart"); 716 EmitBlock(LoopStart); 717 718 llvm::Value *CounterPtr = CreateMemTemp(getContext().UnsignedLongTy, 719 "counter.ptr"); 720 Builder.CreateStore(Zero, CounterPtr); 721 722 llvm::BasicBlock *LoopBody = createBasicBlock("loopbody"); 723 EmitBlock(LoopBody); 724 725 StateMutationsPtr = Builder.CreateLoad(StateMutationsPtrPtr, "mutationsptr"); 726 StateMutations = Builder.CreateLoad(StateMutationsPtr, "statemutations"); 727 728 llvm::Value *StartMutations = Builder.CreateLoad(StartMutationsPtr, 729 "mutations"); 730 llvm::Value *MutationsEqual = Builder.CreateICmpEQ(StateMutations, 731 StartMutations, 732 "tobool"); 733 734 735 llvm::BasicBlock *WasMutated = createBasicBlock("wasmutated"); 736 llvm::BasicBlock *WasNotMutated = createBasicBlock("wasnotmutated"); 737 738 Builder.CreateCondBr(MutationsEqual, WasNotMutated, WasMutated); 739 740 EmitBlock(WasMutated); 741 llvm::Value *V = 742 Builder.CreateBitCast(Collection, 743 ConvertType(getContext().getObjCIdType()), 744 "tmp"); 745 CallArgList Args2; 746 Args2.push_back(std::make_pair(RValue::get(V), 747 getContext().getObjCIdType())); 748 // FIXME: We shouldn't need to get the function info here, the runtime already 749 // should have computed it to build the function. 750 EmitCall(CGM.getTypes().getFunctionInfo(getContext().VoidTy, Args2, 751 FunctionType::ExtInfo()), 752 EnumerationMutationFn, ReturnValueSlot(), Args2); 753 754 EmitBlock(WasNotMutated); 755 756 llvm::Value *StateItemsPtr = 757 Builder.CreateStructGEP(StatePtr, 1, "stateitems.ptr"); 758 759 llvm::Value *Counter = Builder.CreateLoad(CounterPtr, "counter"); 760 761 llvm::Value *EnumStateItems = Builder.CreateLoad(StateItemsPtr, 762 "stateitems"); 763 764 llvm::Value *CurrentItemPtr = 765 Builder.CreateGEP(EnumStateItems, Counter, "currentitem.ptr"); 766 767 llvm::Value *CurrentItem = Builder.CreateLoad(CurrentItemPtr, "currentitem"); 768 769 // Cast the item to the right type. 770 CurrentItem = Builder.CreateBitCast(CurrentItem, 771 ConvertType(ElementTy), "tmp"); 772 773 if (!DeclAddress) { 774 LValue LV = EmitLValue(cast<Expr>(S.getElement())); 775 776 // Set the value to null. 777 Builder.CreateStore(CurrentItem, LV.getAddress()); 778 } else 779 Builder.CreateStore(CurrentItem, DeclAddress); 780 781 // Increment the counter. 782 Counter = Builder.CreateAdd(Counter, 783 llvm::ConstantInt::get(UnsignedLongLTy, 1)); 784 Builder.CreateStore(Counter, CounterPtr); 785 786 JumpDest LoopEnd = getJumpDestInCurrentScope("loopend"); 787 JumpDest AfterBody = getJumpDestInCurrentScope("afterbody"); 788 789 BreakContinueStack.push_back(BreakContinue(LoopEnd, AfterBody)); 790 791 EmitStmt(S.getBody()); 792 793 BreakContinueStack.pop_back(); 794 795 EmitBlock(AfterBody.Block); 796 797 llvm::BasicBlock *FetchMore = createBasicBlock("fetchmore"); 798 799 Counter = Builder.CreateLoad(CounterPtr); 800 Limit = Builder.CreateLoad(LimitPtr); 801 llvm::Value *IsLess = Builder.CreateICmpULT(Counter, Limit, "isless"); 802 Builder.CreateCondBr(IsLess, LoopBody, FetchMore); 803 804 // Fetch more elements. 805 EmitBlock(FetchMore); 806 807 CountRV = 808 CGM.getObjCRuntime().GenerateMessageSend(*this, ReturnValueSlot(), 809 getContext().UnsignedLongTy, 810 FastEnumSel, 811 Collection, Args); 812 Builder.CreateStore(CountRV.getScalarVal(), LimitPtr); 813 Limit = Builder.CreateLoad(LimitPtr); 814 815 IsZero = Builder.CreateICmpEQ(Limit, Zero, "iszero"); 816 Builder.CreateCondBr(IsZero, NoElements, LoopStart); 817 818 // No more elements. 819 EmitBlock(NoElements); 820 821 if (!DeclAddress) { 822 // If the element was not a declaration, set it to be null. 823 824 LValue LV = EmitLValue(cast<Expr>(S.getElement())); 825 826 // Set the value to null. 827 Builder.CreateStore(llvm::Constant::getNullValue(ConvertType(ElementTy)), 828 LV.getAddress()); 829 } 830 831 EmitBlock(LoopEnd.Block); 832} 833 834void CodeGenFunction::EmitObjCAtTryStmt(const ObjCAtTryStmt &S) { 835 CGM.getObjCRuntime().EmitTryStmt(*this, S); 836} 837 838void CodeGenFunction::EmitObjCAtThrowStmt(const ObjCAtThrowStmt &S) { 839 CGM.getObjCRuntime().EmitThrowStmt(*this, S); 840} 841 842void CodeGenFunction::EmitObjCAtSynchronizedStmt( 843 const ObjCAtSynchronizedStmt &S) { 844 CGM.getObjCRuntime().EmitSynchronizedStmt(*this, S); 845} 846 847CGObjCRuntime::~CGObjCRuntime() {} 848 849 850